Boot in to Safe mode and check the issue.
Try a Clean Boot
Open Command Prompt as Admin and type in the following command followed by hitting the Enter key:
sfc /scannow
You can try running an Automatic Repair from the OS disc
- Boot into the Windows 8 disc.
- Once selecting your language, time and keyboard settings, click Next to load the next window, then click on the Repair your computer link on the bottom left corner of the window.
- You should then be presented with a Choose an Option screen, with Troubleshoot as an option to select.
- In the Troubleshoot screen, select Advanced options.
- Select Automatic Repair from the Advanced options screen and then select the target operating system to repair, which would be Windows 8 in this case.
S.Sengupta, Windows Experience MVP